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AI agent for auto mechanics

Diagnostic Code to Repair Plan Agent

Find the real cause of a fault code with the fewest tests and confirm the fix

DecisionsOperations
See how it worksGet access
Diagnostic Code to Repair Plan Agent: what goes in, what the agent does and what you get

What it does

A check engine code rarely names the failed part, and guessing means replacing parts the customer pays for without fixing the car. When a vehicle checks in with a code, this agent reads the codes, freeze frame data, vehicle details and the customer's complaint. It looks up service bulletins and known fixes for that model before any testing. It groups several codes that may share one wiring cause. It builds an ordered test plan, starting with cheap checks like connectors and fuses and the causes that most often fix that code. As the mechanic enters each result, it reranks the causes and suggests the next test. The mechanic chooses every repair and the customer approves the cost. After the repair it asks for a road test and monitor readout. If the code returns, it marks that cause ruled out and moves to the next one.

How it works

Follow the arrows from top to bottom. The orange dashed arrow is the loop: when a check fails, the agent goes back and tries again.

Start and resultWhat it doesA check on its own workWaits for your OKGoes back and retries
ApprovedYes, continueNo 1 STARTS WHEN Vehicle checked in with a code 2 USES A TOOL Read codes, freeze frame and vehicle details 3 USES A TOOL Look up service bulletins and known fixes 4 DOES Build ordered test plan 5 DOES Record test results and rerank causes 6 YOU APPROVE Mechanic chooses the repair and customer approvesthe cost 7 USES A TOOL Read monitors after repair and road test 8 CHECKS THE RESULT Is the code gone and the monitor complete? If not: mark that cause ruled out and test the next one.Back to step 5. 9 RESULT Repair record with confirmed fix
Read the steps as a list
  1. Vehicle checked in with a code
  2. Read codes, freeze frame and vehicle details
  3. Look up service bulletins and known fixes
  4. Build ordered test plan
  5. Record test results and rerank causes
  6. Mechanic chooses the repair and customer approves the costThe agent waits here for your OK.
  7. Read monitors after repair and road test
  8. Is the code gone and the monitor complete?If not: mark that cause ruled out and test the next one. Back to step 5.
  9. Repair record with confirmed fix

How it decides

It ranks causes by how often they fix that code on that model and how cheap the test is, and reranks after every result.

  • Check bulletins before testing
  • Cheap checks like connectors and fuses first
  • Several codes may share one wiring cause

Make it yours

Every agent is a starting point. You choose these settings for your own situation.

  • Repair information sources
  • Test order rules
  • Road test distance required (default 15 miles)
  • Shop labor rate

What keeps you in control

It always asks you first

  • Any repair or part order
  • Customer cost approval

Hard limits

  • Never orders parts
  • Never quotes a price to the customer

It stops when

  • Done: code cleared and monitor complete after road test
  • Stop: fault needs a dealer-only tool or specialist, refer it out

Set it up

We guide you through the set-up, step by step

Members get the full set-up guide for this agent. No technical skills needed: you copy, paste and upload.

10 minto set it up in your AI
5 AIsChatGPT, Claude, Copilot, Gemini, Grok
  • One set of instructions to paste into your AI, with the clicks for ChatGPT, Claude, Microsoft 365 Copilot, Gemini and Grok
  • The agent then walks you through connecting your own data, one source at a time
  • A downloadable copy with the flow chart, the rules and the full guide
Get access to this agent

An example run

What happensA 2017 sedan came in on May 8 with a lean code on bank 1. The bulletin search pointed to an intake gasket, but the smoke test showed no leak. Fuel trim checks found a weak injector, which was replaced. The road test check failed when the code returned. The agent reopened the list, and the next test found a cracked vacuum hose. After that fix the monitor completed.

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